We use spectra extracted from the low entropy regions found in these systems. The regions were identified through pseudo-entropy maps and feature a typical extraction radius of about 120 kpc (see RM10 for images, extraction regions and other details). Although the data reduction is the same reported in RM10, the spectra were re-extracted using a more recent version of the SAS analysis system, namely SAS16.1.
The actual model used within XSPECv12 [1]} to fit the data is wdem. While equivalent to the model described in Sect.REF  wdem parameters are not always the same, more specifically
the slope is defined through \(p\)  where \(p = 1/(\alpha -1)\)  and the temperature range through \(\beta \) , where \(\beta = T_{min}/T_{max}\) . Other parameters are the maximum temperature \(T_{max}\) , the metal abundance \(Z\) , which we have set to [2]} units, and the switch which is set to 2, requiring that the multi temperature model be constructed as the sum of apec single temperature models.
